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PATENTBD FEB. 16,1904;

zr. A. MUMFOBD. STEAM BOILER.

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UNITED. STATES Patented February 16, 1904.

PATENT OFFICE..

JOSEPH A. MUMFORD, orV nosLYN, New Yonx. i'

STEAM-Boue.'

SPECIFICATION forming part of Letters Patent N0. 752,351, dated. February 16, 1904.

. Application flied April 9, igea sans; No. 151,759. (No mand To a/ZZ whom it may concern.-

Be it known that I, J osnrn A. -Mmsmonu a citizen of the Dominion of Canada, and aresident of the village of Roslyn, county of Nassau, State of New York, have invented certain new and useful Improvements in Steam-Boilers, of whichthe following is a full, clear, and

- exact description, reference being had to the IOv accompanying drawings, in which- Figure l illustrates a sideA elevation` of a boiler embodying my invention. Fig. 2 illus-v trates a longitudinal vertical sectional view thereof. Fig. 3 illustrates a transverse vertical section on the line 2 2 f Fig. 2 and looking in the direction of the arrow. o.

This invention relates to` thatsclass of boilers which is known as internallyiired and in which thewater within the boiler has continuous circulation.

It embodies improvements upon the boiler patented to me in and by United States Letters Patent dated April 21, 1896, and numbered 558,698.

In the practical use of boilers made' as described in said patent it has been found that a portion of the hot gases or products of combustion after passing through the fire-tubes in the boiler proper pass downwardly and forwardly between the shell ofthe boiler and the exterior casing and that as they reach the section beneath the fire-pot, where the space is contracted by the downward dip of the boiler# shell, the soot and other products of combustion having considerable gravity, lodged there and engendered corrosive action upon the shell-plates, so that after a time little leakages appeared, which still further accelerated and produced corrosive action, so that in a com# paratively short time the boiler was seriously injured at this part, whereas its other parts were perfectly good and capable of use for years.

Under my present invention, therefore, I modify the construction of the exterior casing, so that while all the parts of the previous construction are retained and utilized the hot gases and products of combustion are prevented from passing downwardly beneath the boiler, and there is no area of comparative quiet in which the soot and like material may be deposited, and I also materially reduce the size or bulk and expense of the boiler as a whole and afford firm rigid support Vfor the water-tank. This is essential, because my boilers arelfrequentlyused upon movable structuresas, for example, on shipboard-and in such cases firm andrigid support for the superposed water-tank is essential. l

. Referring now to the drawings, A isthe water-jacketed boiler proper. It may be made in any preferred mannenl B is the furnace located within the end of the boiler.Y The :shell Cof the furnace-section is in this instance corrugated.

-D D are the re-ltubes.

E isthe superposed steam and waterv tank.

FF are the front and rear water-legs or connecting-pipes, through which the circulation of water induced by the heating takes place in a manner well known.

G is a chamber beyond the end of the boiler proper, with which the fire-tubes connect and in which the products of combustion turn backwardly upon themselves and pass forwardly again in contact with the exterior of the shell of the boiler and of the steam-drum E, iinally escaping through the stack H.

I and J are suitable hand-hole plates for cleansing, as well understood.

The casing K i's or may be composed of a series of plates (see Fig. l) suitably connected by bolted iianges L L, and they extend from about the medial line of the steam and water drum to which they are bolted downwardly to about the medial line of the boiler, as shown, and at the rear end of the boiler these plates are carried downwardly, as shown at M, so as to constitute the chamber G, heretofore re- IOO among them the following: First, owing to the elimination of the exterior casing, such as shown in my previous patent, the size and consequent cost of the boiler as a whole and also its Weight are considerably reduced;- Ysecond, the casing K, since it is made of sufliciently heavy and flanged plates bolted to each other and also firmly bolted to the boiler and water-drum, acts as a firm support or foundation for the drum, because it is by these plates made practically integral with the boiler-4 proper, and is thus firmly supported against the strain to which, owing to the weight of the tank, the structure is subjected when used on a moving support, as, for instance, on loco motives or aboard ship. Also by Filling in the lower part of the chamber G below thelowermost fire-tube with suitable lire-clay, asbestoscement, or equivalent material, as indicated at O, Fig. 2, I provide in the lower part of said chamber a space or receptacle within Vwhich soot and other products of combustion may be deposited, which may be readily removed through the end door I, and no corrosive action can arise from the deposition of this material in this place, because the asbestos-cement or other protective covering O will separate the deposited material from the boiler structure proper, so that no harm will come to it, and inasmuch as the products of combustion have to change their direction in this chamber G in order to pass again forwardly there are more or less eddies formed which afford opportunity for the heavier .products of combustion to drop or precipitateinto the lower hpart ofthe chamber G, as stated.

It will be obvious to those who are familiar with this art that modifications may be made in the details of construction of my improved boiler without departing from the essentials thereof. Consequently I do not limit myself te-the details described and illustrated.

The combination with a boiler having an internal'ire-box and fire-tubes of a superposed JOSEPH A. MUMFORD.

Witnesses: j

PHILLIPS ABBOTT, FLORA M. DoNsBAoH.

water-drum, water-legs connecting the drum 

